Electric heating modified pitch preparation device

Abstract

The utility model belongs to the technical field of metallurgical coking, and particularly relates to an electric heating modified pitch preparation device, which is a single-kettle system, and is characterized in that a material electric heater is connected onto a feeding pipe of a reaction kettle, an outer heat-preservation electric heater is arranged in an outer-side heat-preservation layer of the reaction kettle, a first temperature recording control instrument is arranged at a feeding hole of the reaction kettle, and a second temperature recording control instrument is arranged at a feeding hole of the reaction kettle. The material electric heater and the first temperature recording control instrument are in interlocking control, and a second temperature recording control instrument is arranged on the discharge pipe of the reaction kettle and is in interlocking control with the external thermal insulation electric heater. The utility model has the advantages that: 1) an electric heating process is used for replacing a tubular furnace heating process, and the reaction kettle body also adopts electric heating for heat preservation, so that an external circulation heating pipeline of the reaction kettle for heating by using a tubular furnace is cancelled, and one third of heat supply energy consumption of the reaction kettle is reduced; and 2) the whole modified asphalt process flow is obviously simplified, the blank in the technical field of the industry is filled, and the method has great significance.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical coking, and in particular relates to an electric heating modified asphalt preparation device. Background Art

[0002] In the process of coal tar processing, about 50% to 60% of asphalt is generally produced, which is a major product of tar processing. The larger the processing scale, the more asphalt is produced. Modified asphalt is currently the main downstream product of asphalt, mainly used in the production of pre-baked anodes in the electrolytic aluminum industry, and the preparation of battery rods or electrode binders.

[0003] At present, the domestic production process of modified asphalt mostly adopts the thermal polycondensation method. The thermal polycondensation method can be divided into kettle heating method and tubular furnace heating method according to the heating method. Only the tubular furnace heating method is discussed below.

[0004] The modified asphalt production process of the tubular furnace heating method achieves the purpose of asphalt modification based on the residence time of the reactants of the medium-temperature asphalt in the modified asphalt reactor and the reaction temperature. The residence time is provided by controlling the volume of the reactor, and the reaction temperature is guaranteed by the tubular heating furnace. There are two types of process: double furnace double kettle process and single furnace single kettle process. Double furnace double kettle process uses medium temperature asphalt as raw material, and the reaction is carried out in two steps. The medium temperature asphalt sent from the tar distillation unit has a temperature of about 370℃ and is sent to the No. 1 reactor for primary modification. The temperature in the reactor is controlled at about 380℃ by the No. 1 tubular furnace for heating. The asphalt mainly undergoes β-modification reaction. The flash oil and gas produced by flash evaporation and cracking are discharged from the top of the reactor to the condenser cooler at the back. The asphalt after the primary modification is sent to the No. 2 reactor for secondary modification. The secondary modification reaction process of asphalt is basically the same as the primary modification reaction process. The temperature in the reactor is controlled at about 400℃ by the No. 2 tubular furnace for heating. The α- and β-modification reactions are carried out simultaneously. The flash oil and gas produced by flash evaporation and cracking are discharged from the top of the reactor to the condenser cooler at the back. The asphalt after the secondary modification is the finished modified asphalt. The single-furnace single-kettle process also uses medium-temperature asphalt as raw material. The asphalt is heated in a tubular heating furnace and then reacted in a reactor to complete the reaction in one step. However, the product quality control is not as flexible as the double-furnace double-kettle process.

[0005] The modified asphalt production process of the tubular furnace heating method uses a tubular furnace as a heat source. The heating of the tubular furnace includes two parts: heat to heat the raw materials to the reaction temperature and heat to maintain the reaction temperature. Taking a modification reaction as an example, the medium-temperature asphalt raw material is about 370℃ and is sent to the No. 1 reactor. It is circulated externally through the modified asphalt circulation pump. The circulation volume is 8 times the amount of the medium-temperature asphalt raw material. The external circulation is heated by the No. 1 tubular furnace. The medium-temperature asphalt raw material is heated from 370℃ to 380℃ for a modification, and the reaction temperature of the No. 1 reactor is maintained at 380℃. Maintaining the No. 1 reactor at 380℃ is to make up for the heat dissipation of the No. 1 reactor. Since the modification reaction requires a residence time of 8 to 10 hours, the designed reactor has a huge volume. Although there is external insulation, the heat dissipation of the reactor is still huge. The tubular furnace is an open flame equipment, and the vertical distance from the reactor must be greater than 15m. The circulation pipeline is very long. After production practice, only one-third of the heat supply of the tubular furnace is used for the modification reaction, one-third of the heat supply is used to supplement the heat dissipation of the reactor, and one-third of the heat supply is used to supplement the heat dissipation of the external circulation pipeline. Therefore, it is very important to reduce the heat dissipation of the external circulation pipeline. Utility Model Content

[0006] The purpose of the utility model is to provide an electrically heated modified asphalt preparation device, which overcomes the shortcomings of the prior art, adopts a static modification process, utilizes an electric heater to replace the tubular furnace for heating, and the reactor body is also electrically heated for insulation, eliminating the tubular furnace and its external circulation heating pipeline for heating, reducing the reactor's electric energy heating consumption, and simplifying the process flow of modified asphalt.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] One of the technical solutions: an electrically heated modified asphalt preparation device, which is a single-kettle system, including a reactor, a modified asphalt delivery pump and a weight regulating valve. The modified asphalt delivery pump and the weight regulating valve are provided on the discharge pipe at the bottom of the reactor, and the weight regulating valve is interlocked with the weight detection and recording instrument of the reactor. It is characterized in that a material electric heater is connected to the feed pipe of the reactor, an external insulation electric heater is provided in the outer insulation layer of the reactor, a first temperature recording and control instrument is provided at the feed port of the reactor, the material electric heater is interlocked with the first temperature recording and control instrument, a second temperature recording and control instrument is provided on the discharge pipe of the reactor, the second temperature recording and control instrument is interlocked with the external insulation electric heater, the discharge pipe of the reactor is connected to the modified asphalt tower, and the top of the reactor is connected to the flash oil and gas pipe.

[0009] Technical solution 2: An electrically heated modified asphalt preparation device, which is a double kettle system, including a 1# reactor, a 2# reactor, a 1# modified asphalt delivery pump, a 2# modified asphalt delivery pump, a 1# weight regulating valve and a 2# weight regulating valve. The 1# modified asphalt delivery pump and the 1# weight regulating valve are provided on the bottom discharge pipe of the 1# reactor. The 1# weight regulating valve is interlocked with the 1# weight detection and recording instrument of the 1# reactor. The 2# modified asphalt delivery pump and the 2# weight regulating valve are provided on the bottom discharge pipe of the 2# reactor. The 2# weight regulating valve is interlocked with the 2# weight detection and recording instrument of the 2# reactor. It is characterized in that the feed pipe of the 1# reactor is connected with a 1# material electric heater, the outer insulation layer of the 1# reactor is provided with a 1# outer insulation electric heater, the feed port of the 1# reactor is provided with a first temperature recording and control instrument, and the 1# The material electric heater is interlocked with the first temperature recording and control instrument, the discharge pipe of the 1# reactor is provided with a second temperature recording and control instrument, and the second temperature recording and control instrument is interlocked with the 1# external insulation electric heater; the feed pipe of the 2# reactor is connected with the 2# material electric heater, the outer insulation layer of the 2# reactor is provided with a 2# external insulation electric heater, a third temperature recording and control instrument is provided at the feed port of the 2# reactor, the 2# material electric heater is interlocked with the third temperature recording and control instrument, the discharge pipe of the 2# reactor is provided with a fourth temperature recording and control instrument, and the fourth temperature recording and control instrument is interlocked with the 2# external insulation electric heater; the discharge pipe of the 1# reactor is connected with the feed pipe of the 2# reactor, the discharge pipe of the 2# reactor is connected with the modified asphalt tower, and the tops of the 1# reactor and the 2# reactor are connected with the flash oil and gas pipe.

[0010] The material electric heater is provided with an electric heating wire, an electric heating tube or an electric heating rod.

[0011] The external heat-insulating electric heater is provided with an electric heating wire or a heating belt.

[0012] The surfaces of the discharge pipe and the feed pipe of the reactor are both provided with a heat-insulating layer.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) The electric heating process is used to replace the tubular furnace heating process, and the reactor body is also electrically heated for insulation, eliminating the external circulation heating pipeline used to heat the reactor using the tubular furnace, reducing the heating energy consumption of the reactor by one third.

[0015] 2) The flow rate of the modified asphalt circulation pump in the prior art is 9 times that of the modified asphalt delivery pump in this solution. Therefore, replacing the modified asphalt circulation pump with the modified asphalt delivery pump can save a lot of electricity.

[0016] 3) The use of electric heaters instead of tubular furnace heating eliminates the cumbersome operation and control process of the tubular furnace, significantly simplifies the entire modified asphalt process flow, fills the technical gap in the industry, and is of great significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the process flow of an embodiment of the utility model.

[0018] In the figure: 1-1# reactor, 2-2# reactor, 3-1# modified asphalt delivery pump, 4-2# modified asphalt delivery pump, 5-1# material electric heater, 6-2# material electric heater, 7-1# external insulation electric heater, 8-2# external insulation electric heater, 9-1# weight regulating valve, 10-2# weight regulating valve, TRC-temperature recording control instrument, WRC-weight recording control instrument, E-electric heating wire. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0021] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0022] See Figure 1, is a schematic diagram of the structure of an embodiment of an electric heating modified asphalt preparation device of the utility model, which is a double kettle system, including 1# reactor 1, 2# reactor 2, 1# modified asphalt delivery pump 3, 2# modified asphalt delivery pump 4, 1# weight regulating valve 9 and 2# weight regulating valve 10, 1# modified asphalt delivery pump 3 and 1# weight regulating valve 9 are provided on the bottom discharge pipe of 1# reactor 1, 1# weight regulating valve 9 is interlocked with 1# weight detection recording instrument WRC01 of 1# reactor 1 The discharge pipe at the bottom of the 2# reactor 2 is provided with a 2# modified asphalt delivery pump 4 and a 2# weight regulating valve 10, which is interlocked with the 2# weight detection recording instrument WRC02 of the 2# reactor 2. The feed pipe of the 1# reactor 1 is connected with a 1# material electric heater 5, and the outer insulation layer of the 1# reactor 1 is provided with a 1# external insulation electric heater 7. The feed port of the 1# reactor 1 is provided with a first temperature recording control instrument TRC01, and the 1# material electric heater The device 5 is interlocked with the first temperature recording control instrument TRC01 for control; the discharge pipe of the 1# reactor 1 is provided with a second temperature recording control instrument TRC03, and the second temperature recording control instrument TRC03 is interlocked with the 1# external insulation electric heater 7 for control; the feed pipe of the 2# reactor 2 is connected with the 2# material electric heater 6, the outer insulation layer of the 2# reactor 2 is provided with a 2# external insulation electric heater 8, and the feed port of the 2# reactor 2 is provided with a third temperature recording control instrument TRC02, and the 2# material electric heater 6 is interlocked with the third temperature recording control instrument TRC02 for control; the discharge pipe of the 2# reactor 2 is provided with a fourth temperature recording control instrument TRC04, and the fourth temperature recording control instrument TRC04 is interlocked with the 2# external insulation electric heater 8 for control; the discharge pipe of the 1# reactor 1 is connected with the feed pipe of the 2# reactor 2, the discharge pipe of the 2# reactor 2 is connected with the modified asphalt tower, and the tops of the 1# reactor 1 and the 2# reactor 2 are connected with the flash oil and gas pipe.

[0023] No. 1 material electric heater and No. 2 material electric heater are equipped with any of electric heating wires, electric heating tubes or electric heating rods. No. 1 external insulation electric heater and No. 2 external insulation electric heater are equipped with electric heating wires or heating belts. In order to reduce heat dissipation, the discharge pipe and feed pipe surface of No. 1 reactor and No. 2 reactor are equipped with insulation layer.

[0024] The electric heating modified asphalt preparation method of the utility model utilizes the electric heating process to replace the tubular furnace heating process, adopts the static modification process, cancels the tubular furnace and its connected external circulation heating pipeline in the conventional design, reduces the heat loss of the reactor, and simplifies the process flow of modified asphalt, which specifically includes:

[0025] 1) One reforming reaction, the medium-temperature asphalt raw material is 370°C, heated by 1# electric heater 5, and sent to 1# reactor 1 for a reforming reaction, the reaction temperature is 380-385°C, the external medium-temperature asphalt raw material is heated by 1# material electric heater 5, and the medium-temperature asphalt feed is controlled to be not less than 380°C by temperature recording and control instrument TRC01, and then enters 1# reactor 1 for a reforming reaction; the static residence time of medium-temperature asphalt in 1# reactor 1 is 8-10 hours, and the outer surface of the entire 1# reactor 1 is electrically heated by 1# external insulation electric heater 7 to compensate for the heat dissipation of the outer surface of 1# reactor 1, and the outlet temperature of 1# reactor 1 is controlled to be not less than 380°C by temperature recording and control instrument TRC03;

[0026] 2) Secondary modification reaction: the modified asphalt after the primary modification reaction is sent to the 2# reactor 2 for secondary modification reaction. The reaction temperature needs to be 400-420°C. The primary modified asphalt sent from the 1# reactor 1 is heated by the 2# material electric heater 6. The feed temperature of the secondary modified asphalt is not less than 400°C. Then it enters the 2# reactor 2 for secondary modification reaction. The static residence time of the primary modified asphalt in the 2# reactor 2 is 8-10 hours. The outer surface of the entire 2# reactor 2 is electrically heated by the 2# external insulation electric heater 8 to compensate for the heat dissipation of the outer surface of the 2# reactor 2. Through the temperature recording and control instrument TRC04, the temperature in the 2# reactor 2 is not less than 400°C during the reaction.

[0027] 3) After the secondary modification reaction is completed, the 2# modified asphalt delivery pump 4 delivers the modified asphalt after the secondary modification reaction to the modified asphalt tower. During the process, the weight recording control instrument WRC01 is used to control the modified asphalt outlet flow rate, and the temperature recording control instrument TRC04 is used to control the modified asphalt outlet temperature to 400°C. The function of the weight recording control instrument is to achieve the consistency of the inlet and outlet materials, so as to achieve the purpose of orderly flow of materials and uniform and stable modification reaction to the greatest extent.

[0028] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrically heated modified asphalt preparation device, which is a single-kettle system, including a reactor, a modified asphalt delivery pump and a weight regulating valve. The modified asphalt delivery pump and the weight regulating valve are provided on the discharge pipe at the bottom of the reactor. The weight regulating valve is interlocked with the weight detection and recording instrument of the reactor, and is characterized in that: A material electric heater is connected to the feed pipe of the reactor, an external insulation electric heater is arranged in the outer insulation layer of the reactor, a first temperature recording and control instrument is arranged at the feed port of the reactor, the material electric heater is interlocked with the first temperature recording and control instrument, a second temperature recording and control instrument is arranged on the discharge pipe of the reactor, the second temperature recording and control instrument is interlocked with the external insulation electric heater, the discharge pipe of the reactor is connected to the modified asphalt tower, and the top of the reactor is connected to the flash oil and gas pipe.

2. An electrically heated modified asphalt preparation device, which is a double kettle system, including a 1# reactor, a 2# reactor, a 1# modified asphalt delivery pump, a 2# modified asphalt delivery pump, a 1# weight regulating valve and a 2# weight regulating valve, a 1# modified asphalt delivery pump and a 1# weight regulating valve are provided on the bottom discharge pipe of the 1# reactor, and the 1# weight regulating valve is interlocked with the 1# weight detection and recording instrument of the 1# reactor, a 2# modified asphalt delivery pump and a 2# weight regulating valve are provided on the bottom discharge pipe of the 2# reactor, and the 2# weight regulating valve is interlocked with the 2# weight detection and recording instrument of the 2# reactor, characterized in that: The feed pipe of the 1# reactor is connected with a 1# material electric heater, the outer insulation layer of the 1# reactor is provided with a 1# external insulation electric heater, the feed port of the 1# reactor is provided with a first temperature recording and controlling instrument, the 1# material electric heater is interlocked with the first temperature recording and controlling instrument, the discharge pipe of the 1# reactor is provided with a second temperature recording and controlling instrument, the second temperature recording and controlling instrument is interlocked with the 1# external insulation electric heater; the feed pipe of the 2# reactor is connected with a 2# material electric heater, the outer insulation layer of the 2# reactor is provided with a first temperature recording and controlling instrument, the discharge pipe of the 1# reactor is provided with a second temperature recording and controlling instrument, the second temperature recording and controlling instrument is interlocked with the 1# external insulation electric heater; A 2# external insulation electric heater is provided in the insulation layer, a third temperature recording and control instrument is provided at the feed port of the 2# reactor, the 2# material electric heater is interlocked with the third temperature recording and control instrument, a fourth temperature recording and control instrument is provided on the discharge pipe of the 2# reactor, and the fourth temperature recording and control instrument is interlocked with the 2# external insulation electric heater; the discharge pipe of the 1# reactor is connected with the feed pipe of the 2# reactor, the discharge pipe of the 2# reactor is connected with the modified asphalt tower, and the tops of the 1# reactor and the 2# reactor are connected with the flash oil and gas pipe.

3. An electrically heated modified asphalt preparation device according to claim 1 or 2, characterized in that: The material electric heater is provided with an electric heating wire, an electric heating tube or an electric heating rod.

4. An electrically heated modified asphalt preparation device according to claim 1 or 2, characterized in that: The external heat-insulating electric heater is provided with an electric heating wire or a heating belt.

5. An electrically heated modified asphalt preparation device according to claim 1 or 2, characterized in that: The surfaces of the discharge pipe and the feed pipe of the reactor are both provided with a heat-insulating layer.

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